How to Flatten a Multidimensional Array?

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Is it possible, in PHP, to flatten a (bi/multi)dimensional array without using recursion or references?

I’m only interested in the values so the keys can be ignored, I’m thinking in the lines of array_map() and array_values().

31 Answers
31

As of PHP 5.3 the shortest solution seems to be array_walk_recursive() with the new closures syntax:

function flatten(array $array) {
    $return = array();
    array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });
    return $return;
}

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